摘要
东濮凹陷低渗气藏储量约占该区天然气储量的50%。气藏储层埋藏较深,具有低孔-低渗的物性特征,易受储层应力敏感性影响。以桥口低渗气藏为例,在不同压力下,实测了6个基块岩样和5个实施了人工造缝岩样的渗透率,采用应力敏感性系数评价方法,评价了储层应力敏感性对储层的损害程度。基块岩样的应力敏感性较弱,人工缝岩样应力敏感性为中等偏强。人工缝的应力敏感系数普遍高于基块的应力敏感系数,说明裂缝的存在增加了应力敏感程度。因此,在压裂、测试及生产过程中,应充分考虑储层裂缝和基块的应力敏感性,尽量减少应力敏感性对储层的损害。
The gas reserves of low permeability reservoirs in Dongpu Sag account for 50% of the total gas reserves in this area. The gas reservoirs are deeply buried, low porosity and low permeability, and tend to be affected by stress sensitivity. Taking Qiaokou low permeability gas reservoir as an example, the permeability of 6 block samples and 5 artificially fractured samples are measured at different pressures. The degree of reservoir damage by stress sensitivity is evaluated by stress-sensitive coefficient. The block samples have weak stress sensitivity, while the samples with created fractures have medium-to-strong stress sensitivity. The stress-sensitive coefficient of created fractures is generally higher than that of block, indicating the existence of fractures contributes to stress sensitivity. Therefore, the stress sensitivity of reservoir fractures and block shall be fully considered during fracturing, testing and production process to avoid reservoir damage as much as possible.
出处
《特种油气藏》
CAS
CSCD
2008年第3期84-86,共3页
Special Oil & Gas Reservoirs
关键词
低渗气藏
应力敏感系数
渗透率损害率
东濮凹陷
low permeability gas reservoir
stress-sensitive coefficient
permeability damage
Dongpu Sag
